Fusing Temperature Control - Ricoh B064 Service Manual

6.12.8 FUSING TEMPERATURE CONTROL

This machine uses either on/off control or phase control to control the temperature
of the hot roller. Before shipping, the machine is set for on/off control.
Generally, phase control is used only if the customer has a problem with electrical
noise or interference on the power line. Phase control can be selected with
SP1104-001 (Fusing Temperature Control).
The thermistor contacting the center of the hot roller surface monitors the
temperature of the hot roller. The CPU turns the fusing lamps on and off to keep
the hot roller surface at the target temperature. The target temperature depends on
the paper type.
Paper B064 Series
Normal
185°C±5 (365°F±9
OHP
165°C (329°F)
Thick Paper
190°C (374°F)
SP1105: See the SP table for details.
B064 only: As shown in the illustration, at power on when the temperature is less
than 100°C, there is an interval of 70 s during which the hot roller rotates before
printing starts (this is called 'fusing idling'). This interval allows the hot roller to
reach the control temperature. At power on when the temperature is over 100°C,
printing can start as soon as the hot roller reaches the warm-up temperature of
182°C.
NOTE: 1) SP1103 (Fusing Idling) adjusts the fusing idling time if fusing on the first
and second copies is incomplete due to low room temperature. This
function is available for the B064 Series only.
2) SP1106 (Fusing Temperature Display) displays the current center and
end temperatures for the hot roller.
3) B140 series: SP1907 (Pre Fusing Idling On/Off). If fusing is not
completed on the first few copies with thick paper or OHP, turn idling on
for these paper types with this SP.
SM
IMAGE FUSING AND PAPER EXIT
B140 Series
195°C±5 (383°F±9
374°C (329°F)
200°C (392°F)
6-123 B064 Series/B140 Series/G126
Adjust With
SP1105-001, 002,
007, 008
SP1105-003, 004
SP1105-005, 006